LoadSceneAsync makes the game stutter, even with lowest background thread priority!

I'm using the following calls to load a scene:

Code (CSharp):

1. Application.backgroundLoadingPriority = ThreadPriority.Low;
2. loadingOperation = UnityEngine.SceneManagement.SceneManager.LoadSceneAsync(sceneNameToQueue, LoadSceneMode.Additive);
3. loadingOperation.allowSceneActivation = true;

When I do that call, the game stutters. The scene then loads and activates. If the game stutters using that call, then the whole point of async loading is lost.

Anyone have any idea what the problem could be? I preload the shaders using shader variants. The stutter happens when I preload one of my scenes that has alot of textures. Could that be it? Is there any way to async preload resources in a given scene so that I don't have to "stutter" when I load the scene? Manually loading from different "Resource" paths doesn't seem like a good idea...

 

Are you testing this on a device or in the editor ? you can take a look at this thread: http://forum.unity3d.com/threads/lo...e-at-90-for-large-scenes.379700/#post-2465921

I think something similar was discussed there (the point was that the editor does a bunch of extra stuff that won't happen on a device).

 

Doesn't matter if it's desktop Windows build, editor, ... etc

 

Not all the steps that need to be done when you call LoadSceneAsync are possible to execute in a separate thread.
Some of the stuff needs to be done in the main thread and that might be stuttering.
One example is the start / awake function of your new scene, if its complicated it will eat up quite some time.